You are going to need to add in some dry back to your watering. If the rock wool is always wet, roots don't form properly. If you have roots going all thru the rock wool they don't have a way to lift up. You have some there that I'm afraid are not going to make it.
Here is what I do if it helps:
Soak seeds overnight in water. Tap water is fine. This will get the juices flowing, and is a step that I have found helps to germ even the hardest seeds.
Then put them on a paper towel slightly wet for another day. At the end of which you should see the seed cracked and the direction of the tap root can be determined. They do not all come out in the same direction, some will curl up and shoot for the sky, others will head down.
Open up the hole on the rock wool a bit so that you are not fighting to get the seed exactly where you want it with the root heading down. Now scrape the rock wool to close up the hole at the top and hug the seed in place. Put them in the dark with a small amount of water left in the rock wool, bit not a pool in the tray. If you use a dome, open the vent holes.
Soon, the first seed will break the surface and cotyledons will unfurl. This is the time to add light, even if not all seeds are up yet. If you wait too long, this first one will get leggy and maybe even fall over. You can add light and it will not hurt the others since you closed off the top of the hole in the rock wool.
Adjust your light so that the first one stops growing taller by more than a small percentage. The job now is to force roots down, not stems up.
Once you have first leaves on all you can start to slowly bump the lights up a little a day. Wait until you have a strong root structure coming out of all the rock wool bottoms before transplanting. You may be doing a few each day as they might not grow at the same rate.
Thru all of this, you need to have a dry back period every day. Water from the bottom, not directly on the rock wool. This will encourage roots to grow to seek water.
There are no nutrients needed for the entire germination process.
As far as temps go, that has a big influence on growth rate and success. If you can put a seedling heat pad under and make sure they stay around 75* or so, it will all work easier for you. Too hot or too cold will give poor results.